package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

//自定义切面类,实现公共字段的自动填充功能
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点(对哪些类的哪些方法进行拦截)
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    /**
     * 前置通知
     */
    @Before("autoFillPointCut()")
    public void outoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开始通过自定义注解进行公共字段自动填充...");
        //获取当前被拦截的方法是的操作类型(insert/update)
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获取签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取注解对象
        OperationType operationType = autoFill.value();//获取注解参数,即操作类型

        //获取被拦截大方法参数
        Object[] args = joinPoint.getArgs();
        if (args.length == 0 || args == null) {
            return;
        }
        Object entity = args[0];

        //准备复制对象
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据不同的操作类型,执行操作
        if (operationType == OperationType.INSERT) {
            //插入操作,需要对4个字段复制
            Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            //通过反射为对象赋值
            setCreateTime.invoke(entity, now);
            setCreateUser.invoke(entity, currentId);
            setUpdateTime.invoke(entity, now);
            setUpdateUser.invoke(entity, currentId);
        } else {
            //修改操作,需要对2个字段复制
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setUpdateTime.invoke(entity, now);
            setUpdateUser.invoke(entity, currentId);
        }
    }
}
